Rotary machine



R. J. P. E. COZETTE ROTARY MACHINE Filed Oct. 19. 1925 3 Sheets-Sheet 1 Dec. 14 1926. 1,610,748

R. J. P. E. COZETTE ROTARY MACHINE Filed Oct. 19 1925 V s Sheets-Sheet 2 R. J. -P. E. COZETTE ROTARY MACHINE Filed Oct. 19, 1925 5 Sheets-Sheet 5 Fetent es. id, 192%..

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. ROTARY MACHINE.

Application filed was 19, 1925, Serial m. 63,514, an'd' in France November as, was.

This invention relates to improvements in rotary pumps having blades (and to come pressors of the same type) which are intended to work at high speed.

Numerous arrangements of pumps of this type have already been put forward.

The apparatus forming the subject of the invention, and which 1s hereinafter described has been designed to definitely overcome former disadvantages.

In the accompanying drawing is illus- "trated, in an entirely diagrammatic manner, and only by way of example, one form of construction of the apparatus forming the subject of the invention.

Figure 1 is across section taken along the line II-II -II--II' in Figure 2;

Figure 2 is-a section taken along the line 111411 in Figure 1;

Figure 3 is a section taken along the line 'IVIV in Figure 2 showing a detail of a driving device;

Figure 4 is an arrangement new of Figure 3 showing a modification of the said driving device;

6, finally, show a detail of Figures 5 and the blade arrangement.

The apparatus forming the subject of the invention is essentially characterized by the provision between the blades of the rotor and the stator, of a hollow cylindrical drum or casing turning Witllk the rotor at the same speed as the latter. The pu ose of this ar rangement is to annul the e ects of the centrifugal force, this result being obtained from the fact that, during the working of the apparatus, the blades do not bear against a fixedsurface'. v i a For the same reason, in the apparatus forming the subject of the invention, therubbing of the outer edges of the blades is "prevented, the effect of which is also to remove the diflicultiesof lubrication hereinbefore referred to.

In orderto obtain this result, the apparatus may be constructed in the manner here- 7 formed in the rotor. .As stated above, the

- v -The rotor 1 is enclosed by pl inafter described and illustrated in the drawing.

cylindrical drum 2 mounted u .n two and 3.,"and the'bla es 4 are guided, in the known manner, in diametral grooves 5 rotor and the casing? have to turn at the same speed for theobjectionable efiects of friction to'jbe overcome. the rotor and bearings 3- driving effect. However, in order to pre vent any untimely relative displacement of the members in question, it is expedient to provide a suitable mechanical connection between them.

This connection may be obtained, for example,-by means of the gearing device shown in Figures 3 and 4, which is hereinafter described.

The casing 2 is supported at each end upon cylindrical shafts of large diameter 5 and 5, upon which are mounted the ball bearin s 3 and 3". These-shafts are hollow and a1 ow the passage of the shafts 6 and 6 which support the rotor and which are mounted upon ball bearings 7 and 7 The shaft 5' is extended in a cylindrical part upon which is cut a gear 8; upon the shaft 6' is cut a toothed wheel 9 of the same diameter and the same modulus asthe wheel 8. The wheels 8 and 9 engage with a toothed crown wheel 10 loosely mounted upon the two ball bearings 11 and 11. This arran ement forms a train of hypocyclic gears Whlch drives the rotor 1 and the casing 2 at the same angular velocity and in the same direction of rotation. o i

In the modification shown in Figure 4, the two wheels 8' and 9', similar to the wheels 8 and 9, engage with a relay pinion 12 turning in an opposite direction to the wheels 8 and 9 These mechanisms are only described by way of examples of solutions of the problems considered, but it is naturally understood that it is possible, without altering the economy of the invention, to substitute in them all other devices such as helical gear, bevel gears, Oldham joints, etc.

The drum 2, is, as shown in Figures 1 and 2, pierced b apertures suitably disposed to effect the distribution: on account of the effect of the rotation of the drum, these apertures coincide, at the propermovements, with the'suction and exhaust orifices.

The provision accordingrto the invention, of a rotating cy indrical um 2 interposed between the rotor and the stator has the effect, as explained, of overcoming the disad vantagels resulting from the action of the ce'ntri gal force when working at a high speed. 1

The apparatus forming the subject of the invention also differs from known apparatus of the same type by the provision of a device intended to permit working at low speeds, at which the action of centrifugal force upon the blades is not sufiicient to drive the said blades towards the periphery and to effect as a consequence the fluid-tightness which is indispensable for the good working of the apparatus. This device consists essentially of an arrangement of springs suitably interposed between the body of the rotor and the lower or inner edges of the blades, the said springs always tending to push the blades outwards and to keep them pressed against the cylindrical drum 2, even when thespeed of rotation of the apparatus is low. The springs in question may be of any suitable shape and be interposed in any suitable manner between the body of the rotor and the blades. However, thearrangement hereinafter described which forms one of the features of the invention has particular advantages. The lower edge of the blades 4 is split or notched over a certain part of its length so as to form, as shown in Figure 6, two tongues13 forming springs. Further, the shafts 5 and 5 of the casing are extended, in the interior of the latter, by hollow bosses 14, 14:. These bosses surround the shaft of rotation of the blades. The elastic tongues 13, 13, of each blade bear upon the'outer surface of the said bosses, the effect of which is to produce the displacement of the blades in their grooves, from the centre to the periphery, and consequently to ensure the working of the apparatus whatever he the speed of rotation.

Naturally, the special spring device is only given by way of example, although it forms a feature of the invention, and without altering the economy of the latter any other constructional arrangements may be adopted.

- including ton What ll claim is:

1. A rotary machine comprising, a rotor, a stator, blades on the 'rotor, the rotor being mounted eccentrically in the stator, diametrical grooves in the rotor for movably receiving the blades, a hollow cylindrical drum positioned between'the stator and the blades, and gearing for rotating the rotor I receiving the blades, a hollow cylindrical drum positioned between the stator and theblades, elastic means for pressing the blades against the inner surface of the drum and es formed upon the inner edges of the b ades.

4. A rotary machine comprising, a rotor, a stator, blades on the rotor, the rotor being mounted eccentrically in the stator, diametrical grooves in the rotor for movably receiving the blades, a hollow cylindrical drum positioned between the stator and. the blades, elastic means for pressing the blades against the inner surface of the drum and including tongues formed upon the inner edges of the blades, the tongues being par .allel to the length of the respective blades, shafts formed on' the drum, and inwardly extending bosses on the shafts positioned to bear against the tongues.

name to this specification.

Rent JEAN ram. EMILE coznrra. 

